Many of the visitors who come to Shasta Lake [1] rent houseboats or lakeside cabins in which to enjoy their vacation. (See Houseboating [2] for more information about these types of rentals.)
Links:
[1] http://www.moon.com/destinations/california/lake-tahoe-and-the-northern-sierra/mount-shasta/shasta-lake
[2] http://www.moon.com/destinations/california/lake-tahoe-and-the-northern-sierra/mount-shasta/shasta-lake/houseboating